An improved evaluation of the neutron background in the PandaX-II experiment

Wang, Qiuhong; Abdukerim, Abdusalam; Chen, Wei; Chen, Xun; Chen, Yunhua; Cui, X. F.; Yang, Fan; Fang, Deqing; Fu, Changbo; Geng, Li-Sheng; Giboni, Karl; Giuliani, F.; Gu, Linhui; Guo, Xuyuan; Han, K.; He, Changda; Huang, Di; Huang, Yan; Huang, Yanlin; Huang, Zhongqiang; Ji, Peng; Ji, Xiangdong; Ju, Yonglin; Lai, Y.; Liang, Kun; Liu, HuaXuan; Liu, JiangLai; Ma, Wenbo; Ma, Yugang; Mao, Y.; Meng, Y.; Namwongsa, Parinya; Ni, K.; Ning, Jinhua; Ning, Xuyang; Ren, Xiangxiang; Shang, Changsong; Si, Lin; Tan, Andi; Wang, AnQing; Wang, Hongwei; Wang, Meng; Wang, Siguang; Wang, Xiuli; Wang, Zhou; Wu, M.; Wu, S. X.; Xia, Jingkai; Xiao, M.; Xie, Pengwei; Yan, Binbin; Yang, Jijun; Yang, Y.; Yu, C. X.; Yuan, Jumin; Zhang, Dan; Zhang, Hongguang; Zhang, Tao; Zhao, Li; Zheng, Qibin; Zhou, Jifang; Zhou, N.; Zhou, Xiaopeng

doi:10.1007/s11433-019-9603-9

Cited by 23 publications

(21 citation statements)

References 16 publications

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“…The latest observational run of PandaXII [119] had total (fiducial) mass of Xenon of 580 (330 -360) kg, approximately twice the target mass of LUX. At the energy range of 1 -10 keV ee [201] with a 54 [ton d] exposure, and background of 0.8 × 10 −3 [kg keV day] −1 [119] it essentially matched the constraining power of the most recent 2017 LUX measurements [77], as shown in Fig. 3.…”

Section: Pandaxsupporting

confidence: 67%

“…improved neutron background estimates [201] reduced this overall background to 0.66 − 0.47 × 10 −3 [kg keV day] −1 for the two separate runs that made up the full exposure PandaX is currently being upgraded to PandaX-4T, a four ton experiment with total mass of 2.8 ton in the fiducial volume [202]. In the critical range of 1-10 keV ee , the total electron recoil background 4 − 9 × 10 −5 [kg keV day] −1 and a nuclear recoil background of 2 − 8 × 10 −7 [kg keV day] −1 [202].…”

Section: Pandaxmentioning

confidence: 99%

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Annual modulation in direct dark matter searches

Froborg

Duffy

2020

J. Phys. G: Nucl. Part. Phys.

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The measurement of an annual modulation in the event rate of direct dark matter detection experiments is a powerful tool for dark matter discovery. Indeed, several experiments have already claimed such a discovery in the past decade. While most of them have later revoked their conclusions, and others have found potentially contradictory results, one still stands today. This paper explains the potential as well as the challenges of annual modulation measurements, and gives an overview on past, present and future direct detection experiments.

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Section: Pandaxsupporting

confidence: 67%

Section: Pandaxmentioning

confidence: 99%

Annual modulation in direct dark matter searches

Froborg

Duffy

2020

J. Phys. G: Nucl. Part. Phys.

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“…The third method follows the procedure in Ref. [31], with a predicted ratio between the single-scatter NR and high energy neutron capture gammas. The residual neutron background in the dark matter data is 1.2 ± 0.6 events.…”

mentioning

confidence: 99%

Dark Matter Search Results from the PandaX-4T Commissioning Run

Meng,

Wang,

Tao

et al. 2021

Preprint

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We report the first dark matter search results using the commissioning data from PandaX-4T. Using a time projection chamber with 3.7-tonne of liquid xenon target and an exposure of 0.63 tonne•year, 1058 candidate events are identified within an approximate electron equivalent energy window between 1 and 30 keV. No significant excess over background is observed. Our data set a stringent limit to the dark matter-nucleon spin-independent interactions, with a lowest excluded cross section (90% C.L.) of 3.3 × 10 −47 cm 2 at a dark matter mass of 30 GeV/c 2 .

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“…The neutron background from detector materials is evaluated based on a new method discussed in Ref. [29], using the high energy gammas to constrain the low energy singlescattering neutrons. The total number of neutron events is estimated to be 3.0 ± 1.5 in the full exposure of PandaX-II DM search, within the final signal window and with all cuts applied.…”

Section: Backgrounds In Dark Matter Search Datamentioning

confidence: 99%

Results of Dark Matter Search using the Full PandaX-II Exposure

Wang,

Abdukerim,

Chen

et al. 2020

Preprint

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We report the dark matter search results using the full 132 ton•day exposure of the PandaX-II experiment, including all data from March 2016 to August 2018. No significant excess of events were identified above the expected background. Upper limits are set on the spin-independent dark matter-nucleon interactions. The lowest 90% confidence level exclusion on the spin-independent cross section is 2.0 × 10 −46 cm 2 at a WIMP mass of 15 GeV/c 2 .

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An improved evaluation of the neutron background in the PandaX-II experiment

Cited by 23 publications

References 16 publications

Annual modulation in direct dark matter searches

Annual modulation in direct dark matter searches

Dark Matter Search Results from the PandaX-4T Commissioning Run

Results of Dark Matter Search using the Full PandaX-II Exposure

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